Gemini 2.5 Pro takes the top of the leaderboards
Google released Gemini 2.5 Pro, a 'thinking' model that debuted at #1 on LMArena by a significant margin with a 1M-token context window, marking Google's arrival at the frontier.
Key facts
- Announced 25 March 2025 (experimental)
- Built-in reasoning ('thinking model')
- Debuted #1 on LMArena
- 1M-token context window
- Gemini 2.5 Deep Think variant later achieved IMO gold-medal standard (July 2025)
What happened
Google released a reasoning model leading on math, science and coding benchmarks and human-preference rankings.
Why it matters
Google moved from follower to co-leader of the frontier race, reshaping competitive dynamics in 2025.
Changelog
- 2026-09-29: created
Related events
Sources (2)
- officialGemini 2.5: Our most intelligent AI model (Google)
- discussionWikipedia: Gemini (language model)
id: 2025-03-25-gemini-2-5-pro · updated 2026-09-29 · open in the interactive timeline